基于SMOS、SMAP数据的青藏高原季风及植被生长季土壤水分长消特征研究  

Research on the Characteristics of Soil Moisture in the Qinghai-Tibet Plateau During Monsoon and Vegetation Growing Season based on SMOS and SMAP Data

作　　者：杨娜[1] 汤燕杰 张宁馨 张恒杰 徐少博 Yang Na;Tang Yanjie;Zhang Ningxin;Zhang Hengjie;Xu Shaobo(School of Surveying and Land Information Engineering,Henan Polytechnic University,Jiaozuo 454000,China;School of Geosciences and Surveying Engineering,China University of Mining and Technology,Beijing 100083,China;Wuhan Changqing No.1School,Wuhan 430024,China)

机构地区：[1]河南理工大学测绘与国土信息工程学院,河南焦作454000 [2]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [3]武汉市常青第一学校,湖北武汉430024

出　　处：《遥感技术与应用》2022年第6期1373-1384,共12页Remote Sensing Technology and Application

基　　金：NSFC-区域创新发展联合基金重点项目(U21A20108)。

摘　　要：青藏高原地理位置特殊、环境特征显著,是地球系统作用的关键参与和决策者。利用大尺度的星载微波遥感数据开展其土壤水分研究,不仅能为理解典型地区对全球水、气、能、热交互机制的量化影响提供理论支持,还能够为证实遥感数据的可靠性提供实践依据。以SMOS(2011—2020)和SMAP(2016—2020)卫星土壤水分数据为主,以ISMN实测数据、GPCP降水数据、MOD16A2蒸散发数据、C3S地表类型数据为辅,利用土壤水分(年均值,■)与时间之间的相关系数(R_(xt)),研究青藏高原土壤水分在季风及植被生长季(7—9月)的时空分布及长消特征;进而利用偏相关系数(R_(xy,z)),初步分析了土壤水分与降水和蒸散发的耦合关系。结果显示,青藏高原土壤水分在时间上呈现先减(2011—2015年)后增(2015—2018年)随后波动变化(2018—2020年)的趋势,在空间上呈现自西北向东南逐渐升高的趋势;大部分地区的土壤水分与降水的耦合表现强于蒸散发;SMOS和SMAP对青藏高原土壤水分时空特征的捕捉具有较高的一致性。The Qinghai-Tibet Plateau has a special geographical location and remarkable environmental characteristics,and it is a key participant and decision-maker in the role of the Earth system.Using large-scale satellite microwave remote sensing data to study soil moisture can not only provide theoretical support for understanding the quantitative impact of typical regions on the global water,air,energy and heat interaction mechanism,but also provide practical basis for confirming the reliability of remote sensing data.Based on SMOS(2011—2020)and SMAP(2016—2020)satellite soil moisture data,supplemented by ISMN data,GPCP precipitation data,MOD16A2 evapotranspiration data and C3S surface landcover data,this paper studied the temporal and spatial variability of soil moisture over the Tibetan Plateau during the monsoon and vegetation growing season.Based on the annual mean value of soil moisture(■)and the correlation coefficient between soil moisture and time(R_(xt)),the temporal and spatial distribution and long-term dissipation characteristics of soil moisture in the monsoon and vegetation growing season(July-September)of the Qinghai-Tibet Plateau were studied.Combined with the partial correlation coefficient(_(Rxy,z))the coupling relationship between precipitation and evapotranspiration was preliminaries analyzed.The results showed that the soil moisture decreased first(2011—2015)and then increased(2015—2018)and volatility change subsequently in time,and gradually increased from northwest to southeast in space.The coupling between soil moisture and precipitation was stronger than evapotranspiration in most areas of the Tibetan Plateau.SMOS and SMAP have a high consistency in capturing spatial and temporal characteristics of soil moisture over the Tibetan Plateau.

关 键 词：青藏高原 土壤水分 时空分布 SMOS SMAP 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置] S152.7[自动化与计算机技术—控制科学与工程]